My current STD ED30 showed 364 miles on a tank full this weekend on a round trip to manchester to see family/friends, that was half A road driving (mainly 60mph limits and lots of overtaking wagons crawling along at 40mph to get their maximum hours in
) and half Motorway (cruising at speedo indicated 80mph, GPS 72mph).
I read on another post that a guy on stage 1 was still getting around 330 miles to a tank and another one saying on a long motorway cruise he still got 350.